Machines for contracting the margins of sheet material



Feb. 19, 1957 E. 'QUlNN MACHINES FOR CONTRACTING THE MARGINS OF SHEETMATERIAL Filed Oct. 14, 1955 12 Shets-Sheet 1 Edward Quinn 55 hisAttorney E. QUINN Feb. 19, 1957 MACHINES FOR CONTRACTING THE MARGINS OFSHEET MATERIAL l2 Sheets-Sheet 2 Filed Oct. 14, 1955 Inventor Edward691+ inn By hzs Attornqy Feb. 19, 1957 E. QUINN 2,781,533

MACHINES FOR CONTRACTING THE MARGINS OF SHEET MATERIAL Filed Oct. 14,1955 12 Sheets-Sheet 3 Inventor Edward Quinn By his Attqrney E. QUINN2,731,533

MACHINES FOR CONTRACTING THE MARGINS OF SHEET MATERIAL- Feb. 19, 1957 12Sheets-Sheet 4 Filed Oct. 14, 1955 Inventor Edward Quirm By his AttorneyFeb. 19, 1957 E. QUINN 2,781,533

MACHINES FOR CONTRACTING THE MARGINS OF SHEET MATERIAL Filed on. 14,1955 12 Sheets-Sheet 5 Inventor Edward Quinn By his Attorney Feb. 19,1957 E. QUINN 2,781,533

MACHINES FOR CONTRACTING THE MARGINS OF SHEET MATERIAL Filed Oct. 14,1955 12 Sheets-Sheet 6 QUINN 2,781,533

MACHINES FOR CONTRACTING THE MARGINS OF SHEET MATERIAL l2 Sheets-Sheet 7Feb. 19, 1957 Filed Oct. 14, 1955 Inventor Edward Quinn By his AttorneyFeb. 19, 1957 E. QUINN 2,781,533

MACHINES FOR CONTRACTING THE MARGINS OF SHEET MATERIAL Filed Oct. 14,1955 12 Sheets-Sheet 8 Fly I6 I L Inventor r Edward Quinn ZZZ Z2 .56

" By his Attorney E. QUINN Feb. 19, 1957 MACHINES FOR CONTRACTING THEMARGINS OF SHEET MATERIAL Filed Oct. 14, 1-955 12 Sheets-Sheet 9Inventor Edwa r d Qu inn 4 z Av w w m 2 m 0 6 6 w a 9 2 2 L718 K. J 65/1 M 64 a 3. Fa r? Z W J mqn ..IIW/ a w. .M, z /0 J i i a Feb. 19, 1957QUINN 2,781,533

MACHINES FOR CONTRACTING THE MARGINS OF SHEET MATERIAL Filed 001;. 14,1955 12 Sheets-Sheet 10 Jay .23 5% w W4 nn% /2 /6 i illlll if I my lg,

282 //z Z 5 i W1. Fig. Z4 I Z5 1, 353 0 C) Z 0 6 56 i F 262 //Z 26 2665. 5g O -04 W Q I 6Z Inventor Edd/a rd Quinn By his Atzf'orrzey Feb. 19,1957 E. QUINN 2,781,533

MACHINES FOR CONTRACTING THE MARGINS 0F SHEET MATERIAL.

Filed Oct. 14, 1955 12 Sheets-Sheet 11 Inventor. Edward Quinn By hisAttorney Feb. 19, 1957 NN 2,781,533

MACHINES FOR CONTRACTING THE MARGINS OF SHEET MATERIAL Filed Oct. 141955 12 Sheets-Sheet 12 Inventor Edward Quinn By his Attorney UnitedStates Patent MACHINES FOR CONTRACTING THE MARGINS 0F SHEET MATERIALEdward Quinn, Saugus, Mass., assignor to United Shoe MachineryCorporation, Flemington, N. 3., a corporation of New Jersey ApplicationOctober 14, 1955, Serial No. 540,441

25 Claims. (Cl. 1297) This invention relates to machines for crimpingthe margins of substantially flat pieces of sheet material to shortensaid margins to predetermined lengths for causing the portions of thematerial adjacent to the margins to assume concavo-convex shapes. Themachine herein illustrated is more particularly adapted to crimp andshorten the fore-part margin of a shoe upper to impart a pre-lastedshape to the upper, thereby facilitating the accurate fitting andattaching of the upper to a bottom member such as an insole andconsequently also facilitating the subsequent assembly of such shoeparts with a last. It is to be understood, however, that in variousnovel aspects the invention is not limited to the particular embodimenthereinafter described.

In machines of this type ditficulty has been encountered in the past incrimping a piece of material so that the margin thereof would beuniformly crimped and shortened to a predetermined length. length haveresulted in improper or difficult fitting and assembly of the workpieces to other accurately out parts;

An object of the present invention therefore is to overcome the problemof non-uniform crimping, thus resulting in savings in time and expenseinvolved in the fitting of inaccurately crimped shoe uppers to matingAnother object of the invention isto Inaccuracies in crimped from theapplication of heat, to harden the material while the work piece isstill under the control of the machine, thereby eliminating thepossibility of deforming the crimped margin. A further object of theinvention is to provide means for varying the amplitude of the puckersto obtain a greater or lesser shortening of the crimped length of thework piece margin.

Various features of the invention, including novel details ofconstruction and combinations of parts, will now be more particularlydescribed with reference to the accompanying drawings and thereafterpointed out in the claims.

In the drawings,

Fig. 1 is a view in front elevation of the upper portion of one form ofmachine embodying the invention;

Fig. 2 is a view of the lower portion of the machine in front elevation;

Fig. 3 is a section on the line III-III of Fig. 2;

Fig. 4 is a plan view of the machine;

Fig. 5 is a view in front elevation of the machine with parts brokenaway;

Fig. 6 is a view partly in right-hand side elevation and partly insection showing parts of the crimping and table feeding mechanism;

Fig. 7 is a view partly in plan and partly in section.

2,781,533 Patented Feb; 19, 1957 away showing the crimping tooloperating cam and the wiper operating cam;

Fig. 12 is a view similar to Fig. 9 showing the position of the 'partsafter the feeding movement of the work table; a

Fig. 13 is a section substantially on line XIII-XI1I of Fig. 12;

Fig. 14.is a view partly in plan and partly in section showing theheated wiper and portions of its operating mechanism;

Fig.' 15 is a left-hand side elevation of the heated wiper andassociated mechanism;

Fig. 16 is a section substantially on line XVI-XVI of Fig. 15;

Figfl7 is a view in front elevation with parts broken away showing therelation of the heated wiper to the I work supporting and guiding parts;

Fig. 18 is a view in front elevation with parts broken away showing therelation of the'heated wiper to the work margin supporting members;

Fig. 19 is a view partly in plan and partly in section showing bers;

Fig. 20 is a plan view, with parts broken away, of the work supportingand holding parts;

Fig. 21 is a view in right-hand side elevation of a tion of the machineon an enlarged scale;

Fig. 22 is a rear elevation of the work supporting and margin guidingmembers;

Fig. 23 is a rear elevation of the work supporting and gripping members;

Fig. 24 is a view partly in right-hand side elevation and partly insection showing the relation of the flange forming roll, the work table,and the heated wiper;

Fig. 25 is a view partly in right-hand side elevation and partly insection showing the mounting of the heated wiper;

Fig. 26 is a view similar to Fig. 24 showing the position of the partsduring insertion of a work piece;

Fig. 27 is a view similar to Fig. 26 with the parts in work engagingposition;

Fig.- 28 is a plan view of a portion of the machine operating on a workpiece; I

Fig. 29 shows in rear elevation portions of the pucker forming elementsand parts associated therewith as they appear in relation to a workpiece when the elements are in their initial position;

Fig. 30 is a view similar to Fig. 29 showing the position of the partsafter the downward stroke of the pucker forming tool but prior to thefeeding movement of the work table;

the work supporting and flange forming mem- Fig. 31 is a view similar toFig. 30 showing the posi Fig. 33 is a view similar to Fig. 30 showingthe appearance of the work piece after formation of a series of puckersand during the wiping movement of the heated wiper;

Fig. 34 is a plan view of a forepart member of a shoe upper prior to thecrimping operation;

Fig. 35 is a plan view showing the appearance of a forepart member of ashoe upper after the margin thereof has been crirnped and flanged;

Fig. 36 is a view similar to Fig 34 with a forepart thereof, theillustrated machine is provided with a work support-'2 (Figs.' 4 and22-). The'support 2 consists of a substantially horizontal plate 6secured to a slide 8 which is mounted for lateral adjustment in adovetail slideway 10 (Fig 21) in a bracket 12. The lateral position ofthe work support 2 relatively to the'bracket 12 isdetermined by meansofan adjusting screw 14 in. the slide s arranged-to abut the left end ofthe bracket 12 as viewed in Fig. 22, the slide being clamped: inadjusted position by a clamping screw-161' Alsopivotally secured to thebracket 12 by a shoulderscrew '18 (Fig. 23.): is 'a gripper member 20the purpose of which, will hereinafter appear. The bracket 12 is fixedby a screw 22 :(Fig. 22) man upstanding member 24 secured for heightwiseadjustment on a carrier block 26 by a screw 28. The carrier block 26 ismounted in a. dovetail slot 31 (Fig; 6) formed in the upperend of aslide 32 which is mounted for vertical sliding movements in a bracket 34attached to the front side of a machine frame 3. Thei-slotil'al'. issplit by a downwardly extending clearance slot 33: whichallows the block26 to be clamped in the slot 31 by two screws 30 (Figs. 1 and 6). Atreadle rod 36:.threadedinto the slide 32 extends downwardly from theslide and is connected to a treadle 38 (Fig. 2)

Cooperating with the work support 2 for guiding the margin-of-the workpiece is a margin guide 4 (Figs. 4 and 28) consisting of a verticalplate 64 (Figs. 19, 21, and 22) having a forwardly extending lip 65 andbeing secured by two screws 66 to an intermediate bracket 68 which inturn is secured for lateral adjustment on an L-shaped member 70 by ascrew-72. The member 70 is mounted for forward and rearward adjustmentin a groove formed in the upper end of a bracket 74 (Fig. 21) secured toan upstanding portion 76 of the bracket 34, the member 76 being securedto the bracket 74 by a screw 78. Therefore, by adjusting the member 70on the bracket 74, the margin guide 4 may be adjusted forwardly orrearwardly to vary the position of the margin of the work piece inrelation to the operating elements of the machine.

For the purpose of holding th work piece against movement during aportion of the machine cycle, the machineis provided-with-a presser foot80' (Fig. 21) arranged to clamp the work piece against a beveled portion82 (Fig. 23) of-the plate 6 of the work support 2. The presser foot 80is mounted to swing about a shoulder screw 84 threaded into a bracket 36which is secured to the bracket- 74 by two screws -88: A spring 98,extending froma rearwardly extending arm 92 of the presser foot to a pinmounted-inthe frame 3 urges the presser foot to swing in acounterclockwise direction, as shown in-Figl-ZL- to engage thework pieceat the proper time. A stop member 94, secured for heightwise adjustmenton-the=-bracket--86,'limits the motion of the presser foot when there isno work piece on the support 2.

As a work piece- W (Figs.-28 and 34) is intermittently 7 fed lengthwiseof its margin, in amanner to be hereinby meansbf a lever 40 and a link42 (Fig. 3). The

slide 32 is urged upwardly by a spring 44 which is confined. between thelower end of the slide and a sleeve 46 (Fig. 1) threaded into the lowerend of the bracket 34'.-:- A. stop collar 48 clamped on the treadle rod36 by a thumb screw 50 and arranged to engage the lower end of thesleeve 46 liniits the upward movement of the slide-32 and thusdetermines the heightwiseposition of the support 2 carried indirectly bythe carrierblock 26.

Also mounted on= the. blocki26, by -a dovetail connection, is a bearingmember 52 (Figs. 1 and '6) which is adjustable forwardly and rearwardlyby means of an adjusting.screw-54 having both leftand right-hand screwthreads threaded respectively in the bearing member and in thercarrier.blocki. A circular work table 56 adapted to support a portion of thework piece and having uniformly-spacedgrooves'58 (Figs. 6 and 28) aroundthe periphery thereof, the purpose of-which will hereinafter appear,isrotatably: mounted in the upper portion of the bearing member 52.;Mounted on a bracket 60 (Figs. 18 and 23.) secured :to the member 52, isan arcuate work support 62 which is concentric with and extends around a:portion of the table 56. To provide for convenient placement-of .aworkpiece before and after being operated, on by the machine, a table '63(Figs. 1 and 4) is mounted adjacent to and surrounding the front portionof=thecircularwork table 56, the table 63being secured by: screws .67:to a bracket-69 mounted :on the A front side of the carrier block 26.Since the work support 2, the circular table 56, the arcuate worksupport 62, and the table 63 are each carried by the carrier block. 26,it:may be seen that by depressing the treadle 38 againstithe action ofthe spring 44, the work supporting elements of the machine will belowered to facilitate the insertion or removal of a work piece.

after described, being so guided by the support 2 and the guide 4, themargin of the-work piece passes under a crimping-tool1%(Figs. 6 and 29).The crimping tool: 1001's moved down in timed relation to the feedingmovements ofthe workpiece to form a pucker therein byforcingtheworkpiecemargin over an edge of the support .2 ina direction normal to thesupporting surface. Prior to the downward movement'ofthecrimping tool,theiwork engaging surface of the gripper 20 is yieldingly; maintained ina position substantially flush with the .beveled portion 82 on thesupport 2 to engage the lower. surface of thework piece directly underthe crimping' tool 100. The gripper20 is maintained in position by aspring..102z(Fig. .23)-which extends from an arm 104 ofthegripper to apin 105 in the bracket 74 and which swings the gripper in -acounterclockwise direction as viewed in. Fig. 23 .until the arm 104contacts a stop meniber=106vfixed to the bracket 12. As the crimpingtool :100 forces the margin of the work piece down, as viewed in. Fig.30, the gripper Ztlacts to clamp the work Piece against. the lower endof the tool and is moved down by :themotion of the tool acting throughthe work piece and against theaaction of the spring 102- The effect ofthe combinedaction of the tool and the gripper on theworkpiece .istoadvance the work piece along the work support; and down over the edge ofthe plate 6 ad jacent to, the bevel, 82 to form a puckerin the margin ofthe work piece. Also. as the tool 100 moves down, an adjustable abutment108 (Fig. 21) on a carrier arm 110 contacts the arm 92 of the presserfoot 80 to depress-the ar-mend raise :the presser foot toallow the workpiece {C be moved by the actionbfthe crimping tool and gripper.

At the lower limit of the downward motion of thecrimping tool, thepucker formed in the work piece is partially forced by the tool into oneof the peripheral grooves 58 inlhecircular work table 56, as illustratedin Fig. 30. At this time the table 5 6 is stationary and maintained inposition by meanshereinafter to be described so that one of the grooves58 in the table is in position to receive the pucker. A fter forming apucker in the work piece, the. crimping -tool,. while holdingtheformedpucker in one when 5 of the grooves 58, moves lengthwise of the marginofthe work piece .to the right, as viewed in Fig. 3.1. At'the same timethe table is rotated .at the same speed as the tool so that the .toolholds the pncker in a groove while the table feeds the work piece. Asthe tool moves to the right, it moves away from the gripper 21) which isthen swung up by the spring 102 (Fig. 23) to its initial position, thusimparting a slight drag to the work piece adjacent to the crimping tool.After losing contact with the gripper, the puckerjstill engaged by thecrimping tool, is moved by the table 56 on to the arcuate work support62 which will support the lowersurface of the pucker in cooperation withthe circular work table while the upper surface of the pucker issubsequently engaged by a heated wiper 112 (Figs. 14 and 18). After thefeeding motion of the work piece, the crimping tool 190 rises verticallyand returns to its initial position as illustrated .by broken lines 31.During the return movement of the crimping tool, the heated wiper 112 iscaused by means hereinafter described to move to the left, as indicatedby broken li'nes in Fig. 31, to apply heat and pressure .to the formedpucker for imparting a permanent set to the formed material.

For imparting the pucker forming and feed following movements ,to thecrimping tool 1 0, the tool is clamped to the carrier arm 110 (Figs. '5and ,6) by a'screw 114-1111? plate 115. For imparting a lateralfeed-following movemerit to the crimping tool, the arm 11!) ismounted'to swing about a pin 118 carried in one end of a-lever 120. AnL-shaped member 122 (Figs. 6 and 7) secured to the rearward side of thearm 110 is arranged to engage a ,chrn 124 on a shaft 126, the member 122being ,yieldingly held agains't'the .cam by a spring 128 extending from,a Pin 130 in the am .1111 to a pin 132 in the frame 3 adjustable stopscrew 133 defines the initial lateral position'of the arm 110 and henceof the tool 100 for alinenient ofthe tool, during its downward movement,with one of the grooves 58 in the circular table.

For imparting a .vertically reciprocating pucker forming movement to thecrimping tool 100 through the carrier arm 110, the lever 120 is carriedby a rockshatft 1351 (Figs. 4 and which is journaled in apart of theframe 3'. A oam llever 1136, fixed to the rearward end of the rockshaft,has on its lower end a cam roll 138 (Fig. 11) riding in atrack 140 in acam wheel 142 fixed to the shaft 126. A motor 144 (Fig. 2) having apulley 146 drives a belt 148 which runs on the pulley 14.6 and a pulley150 (Fig. '4) on the rearward end of the shaft 126 to drive the shaft ina counterclockwise direction as viewed in Fig. 11. Rotation of the shaftcauses the track 1411, acting through the cam lever 136, the lever 120,and the carrier arm 110 to move the crimping tool 100 in a directionriormalto the surface of the work piece while'caus- "tag the cam 124acting through the member 122 and the carrier arm 11% to fswing the'tool100 lengthwise of .the margin of the work piece in timed relation to thenormal movements of the tool. The effect of these combined motions is tocause the crimping tool to traveliin a rectangular path along a planenormal to the surface of the work piece. Thus at the beginning cycle ofthe machine, the tool travels down to form a puck'er in the work piece;then at the end of its downward movement, the tool moves laterally withthe feeding movement of the work piece. At the end of its lateralfeeding movement, the tool moves up and then laterally to return to itsinitial position. It may be'seenthat'b'y raising or lowering the initialposition of the 'crimping tool 161) relative to its carrier arm 111)thatthere will be more or less lost motion of the tool before itcontacts the work piece during the pucker forming movementof the tool.By raising the tool'on'its carrier arm, a smalleramount of the verticalmotion of the tool will be effective to forma pucker in the work pieceresulting in a pucker of less amplitude causing ,alesserfor'eshortenin-g of the margin of the work piece. By lowering the toolon its carrier arm, vmore of the vertical motion of the tool wi l beeffecti e o form a Pu er of re ter amp i ude resulting in a reater freshortenin o h wo p ece mar For altsma v feed ng and ho d ng theircular work t b e fi'; the ma hine i pr ide wit a fee n pawl 1 5 2 anda hold n paw 5 (F h h ar adapte t 'fen a etbe ro vs 5,8 nt 'p rip ry othe tab ehe eed n wl .5 i m un o f w a rea w s d n .mqyement n a slideay 5, f m d n an upstanding portion 157 of a slide 15 8 which in turni smounted for oscillatorys lidin g movements on an arcuate o et l sidewai' lfifiwnq ntr h the o ble 5 and fo med in a c os m mbe 6 (Fi hero m mber l l7 dbY s rew 16.6 b tw n e u an ng o t n 760:1? t e b acke 4an a s m a p ion 164 s 5 an 91 11 16 ame a ke A Pin 6 (Fi .8 nd 9) in hfeeding awl 15 ex n s t rqv h l 70 i n si of th ga de 1 o t e li e 8 ahas attached tt s eto 1 mins 72 whic extends t am e p hea Pi .71% fixe tth re s 9 t s i e 5.

r 1 n e P 68 qnstanfl o u g he P?W :1. .IYK% T l3 ?WY from hr e ta l 6to a position determined by a surface 175 (Figs. 8 and 13) are tpawlqperil' m mb 7 The m mb 6 is k cal adjustment on a block 173 secured ta {1 QP 1d, 'f ?F@k? (P e .6) i s se e o the Pe rie a m 1.? b a ew 17 e member176 being secured to the block by a screw (Fig. 8). Ihus, it may be seenthat when the crimping tool es down with the arm 110, the pawloperating'memher 176 also moves down and the forwardly inclined surface175 on the member 176 causes the feeding pawl 152 to he moved forwardagainst the action of the'spring I172 to engage ohe ,ofthe grooves 58 inthe table 56 as shown trig 3 7.. v

For moving the slide 158 along its rslideway 160 for cansing the feedingpawl 152 to impart a feeding motion to the circular table 56, thebracket 177 has secured thereto another block 180 (Fig; 6) which carriesa rod 182 having asubstantiaflly ball shaped end 184. The end 18 1 ofthe rod is received in a slot 186 (Fig; 9) formed by one sideoftheportion .157 of the slide 158 and an offset plate 138 mounted on'thesame portion, thereby connecting" the slide 158 to the'carrier arm 110."Thus, as the crimping tOoLbeingcarri'ed by the arm 110,"-is movedlengthwise or the margin of the work piece," .the slide 158 and hencethe pawl 152 likewise are moved by the rod 182 but in an arcuate pathconcentric with the circular work table 5 6. Since at this time thefeeding pawl 152 is held forward by the member 176 in eng gernent withthe work table 56, the work'table is rotated by the pawl' in timedrelation to the movement of the crimping tool. i

for-positioning and holding the work table 56 in proper relationito thecrimpingtool 101) so each of "the grooves .58 in the table is inposition to receive each successive pucker as it is formed 'by the tool,the holding pawl 154, adapted to engage successively each groove, ispivotally mounted in a slot 19!) (Fig. 13) formed in the lower portionof the cross member 162 to swing about a pin 192 in the cross memben Atorsion spring 194 mounted on the pin 192 and engaging atone end asurface 196 on the cross member and at thei'opposite end engaging a pin1 98 in a rearwardly extendingarm 200 of the pawl 154 urges the pawl toswing in a counterclockwise direction as viewed in Fig. 13 to a positioneither engaging a groove in the table or as limitedby engagement oftheupperend of the arm 200 with a rearwardly inclinedsu'rface 202 on thepawl operating member 176. Thus it maybe seen that as the downwardmovement of the member 176 causes the feedingpawl 1152 to move forwardtoengage one ofthe grooves 56 in the table 516, it also .causes'theholding pawl 1 55ttoswing rearwardly, abon'tthe pin 1'92 and out ofengagement with the same groove iiithetable. As the slide 158; its feedingpawl (152, and the member 176 reach the limit of their tablefeeding movement, the member 176 loses contact with the arm 200 and thespring 194 swings the holding pawl 154 forwardly to engage the nextadjacent groove in the table. As the crimping tool is moved up duringits return movement, the feeding pawl 152 is moved rearwardly by itsspring 172 out of engagement with the table 56. At the same time theholding pawl 154 serves to prevent movement of the table and also servesto position the next groove 58 for receiving the next pucker formed bythe crimping tool.

For applying heat and pressure to the puckered portion of the work piecefor imparting a permanent set to the puckered material, the heated wiper112 (Figs. 14 and 18) is arranged to overlie the arcuate work support 62and the adjacent peripheral portion of the circular work table 56 whichhas the grooves 58 formed therein. It should be noted again that afterformation, each successive pucker is received in one of the grooves 58in the work table and is supported from below by both the table and thearcuate work support. As the work piece is fed by the table 56 afterformation of a pucker, the wiper 112 is moved in an arcuate path in thesame direction and speed as the work piece thus applying no wipingaction at that time to the work piece. However, at the end of thefeeding cycle and while the crimping tool is returning to its initialposition, the wiper 112 moves to the left, as viewed in Fig. 31, to wipeover and apply heat to the newly formed pucker. At this time, the Worktable is held stationary by the holding pawl 154, and the presser foot80 is holding the work piece down against the sup-.

port 2, thus effectively preventing any lengthwise motion of the workpiece.

For performing the heating and pressing operation, the wiper 112 isformed at the forward side of a block 204 (Fig. 14) which contains aheating unit 206 connected to a suitable electrical circuit forsupplying heat to the wiper. The block 204 is secured to a plate 208 byscrews 210 but is separated from the plate by insulating spacers 212(Fig. 15) to confine the heat to the wiper and its block. The plate 208has formed on the under side thereof an arcuate dovetail 214 (Fig. 17)which is mounted for arcuate sliding movements in a dovetail slideway216 formed in the upper side of a member 218, the slideway beingconcentric with the work table. To limit the clockwise movement of thewiper 112, as viewed in Fig. 14, the plate 208 is provided with a stopscrew 220 threaded into a depending lug 222 secured to the plate, thestop screw being arranged to contact the forward side of the member 218(see Fig. 15 The member 218 is secured at its rearward side to a bracket224 (Fig. 15 which is mounted for lateral adjustment by a dovetailconnection on a forwardly extending bracket 226, the bracket 224 beingclamped in adjusted position by a clamp screw 228 in the bracket 226.The bracket 226 has a rearwardly extending portion 230 which is mountedfor forward and rearward adjustment on a lug 232 formed on asubstantially U-shaped arm 234 (Figs. and 21), the bracket 226 (Fig.being secured in adjusted position by a plate 233 clamping the portion230 to the lug 232 by a clamp screw 235. The arm 234 (Fig. 5) is mountedfor forward and rearward swinging movements about a pin 236 and a pin238, both pins being secured in alined bores 237, 239, respectively, inthe frame 3. A spring 240 (Figs. 5 and 21) extending from a pin 242 inan extension 244 of the arm to a pin 246 in the frame 3 causes the arm234 to swing rearwardly to a position limited by engagement of a stopscrew 243 in the arm with the frame 3. Thus, by means of theabove-described wiper carrying mechanism, the wiper 112 is capable ofupward yielding movement against the action of the spring 240 and theinitial heightwise portion of the wiper is determined by adjustment ofthe stop screw 248 in the arm 234. It may be seen by a comparison ofFigs. 24 and 27 that the initial heightwise position of the wiper isdetermined by adjustment of yield up against the action of the spring240 in order to accommodate passage of the work piece under the wiper,thus applyinga definite amount of pressure to the work piece asdetermined by the tension of the spring.

For moving the wiper 112 laterally with the feeding motion of the workpiece in timed relation to the movement of the work table 56, the block180 (Fig. 6) mounted on the bracket 177 and carrying the feed mechanismoperating rod 182 also carries a bar 250 having mounted thereon anabutment 252 (Fig. 14). The abutment is arranged to contact an extension254 on the right end of the plate 283, as viewed in Figs. 14 and 17, andduring its feeding movement the arm acting through the abutment 252moves the plate 208 on its slideway 216 in a counterclockwise direction,as viewed in Fig. 14. Thus, through the above-described mechanisms, thetable 56, the crimping tool 100, and the wiper 112 all move together intimed relation during the feeding movement of the work piece.

For moving the wiper in a reverse direction after the feeding movementof the work piece to apply heat and pressure to the newly formed puckerin the work piece, the plate 208 has mounted at its rearward side anupstanding member 256 (Figs. 14 and 15) having formed thereon a lug 258which is arranged to be engaged by an extension plate 260 (Figs. 10 and14) secured to an arm 262. The arm 262 is mounted for transverseswinging movement about a shoulder screw 264 (Figs. 8 and 10) whichpasses through the lower end of the arm and which is threaded into a bar266 secured to the upstanding portions 76 and 164 of the bracket 34.Midway of its ends the arm 262 has therein a transversely inclined slot268 which receives a forwardly extending pin 270 on one end of a lever272. The lever 272 is carried by one end of a rock-shaft 274 (Fig. 11)which is journaled in a part of the frame 3. A cam lever 276 fixed t0the other end of the rock-shaft 274 carries at its outer end a roll 278riding in a cam track 280 in the cam wheel 142 on the shaft 126.Rotation of the cam shaft 126 causes the track 280 acting through thecam lever 276, the lever 272, and the pin 270 to swing the arm 262 andits associated extension plate 260 clockwise, as viewed in Fig. 10,after the work piece has been fed. Clockwise movement of the extension260 acting on the lug 258 (Fig. 14) causes the plate 208 and itsassociated wiper 112 to be moved along the slideway 216, thus moving thewiper over the upper surface of the newly formed pucker to impart apermanent set to the puckered material along the margin of the workpiece. To accommodate any reverse crowding of the material which mightcause a back feed of the work piece during the wiping operation, thearcuate work support 62 is provided with a depression 277 as seen inFigs. 23 and 33.

After the setting operation performed by the heated wiper, the puckeredmargin of the work piece is soft and pliable from the application ofheat and therefore may be easily deformed. To avoid accidentaldeformation of the work piece, the machine is provided with a coolingiron 310 (Figs. 4 and 28) which is adapted to dissipate heat from thehot marginal portion of the work piece so that the puckered materialwill quickly cool and harden. The iron is arranged to engage the uppersurface of the work piece as it moves from under the heated wiper notonly to dissipate heat from the material, but also to preventdeformation of the work piece while being hardened. For this purpose,the iron 310 is adjustably secured by a screw 312 (Figs. 1 and 4) to amember 314 which is also adjustably secured by a screw 316 to an arm318. The arm is mounted for vertical swinging movements about a pin 320carried in the upper end of a bracket 322 which is secured on the frontside of the bracket 34. A light spring 324 extending from the arm 318 toa pin in the bracket 322 urges the arm to swing in a clockwise directionas viewed in Fig. 1 to cause the iron to rest yieldingly on the uppersurface of the hot puckered marginof the work piece as seen memes inFig. 28. In this manner, the puckered margin of the work piece is cooledand hardened while still under'the control of the machine and before anyaccidental deformation of the margin can take place.

For forming a flange F (Figs. 35 and 37) along the puckered margin ofthe work piece, as well as to bulge the body of the work piece upwardlyto preshape the work piece, the machine is provided with a forming roll282 (Figs. 4 and 27). The roll normally lies adjacent to and cooperateswith the heated wiper 112 to bulge the body of the work piece upwardlyat substantially right angles to the margin of the work piece engaged bythe wiper, as shown in Fig. 27. The roll rotates freely on a shoulderscrew 284 threaded into one end of a plate 286 (Fig. 19) having at itsopposite end a depending lug 288 secured to a lever 290 (Fig. 21) byscrews 292. The lever is mounted to swing about a shoulder screw 294threaded into a block 296 fixed to the carrier block 26. A spring 298extending from the lever to a plate 300 secured to the bracket 74 urgesthe lever to swing about the screw 294 in a clockwise direction, asviewed in Fig. 21, to a position limited by an adjustable stop screw 302in an arm 304 of the lever 290, the stop screw being shown in Fig. 26 tofacilitate the insertion or removal.

of a work piece from the machine.

The manner of the normal operation of the machine will now be brieflysummarized. After closing the electrical circuit to the heating unit 206to heat the wiper 112, and starting the motor 144, the operatordepresses the treadle 38. Depression of the treadle moves the carrierblock 26 down with the slide 32 against the action of the spring 44,thus lowering the work supporting elements comprising the work support2, the circular work table 56, the arcuate work support 62, and thetable 63 to facilitate the insertion of a work piece into position toAlso, as the carrier.

be operated on by the machine. block moves down, the lever 290 swingsforward to move the forming roll 282 away from the heated wiper toenable the work piece to be inserted under the wiper. While the worksupporting elements are in a lowered position, being so maintained bydepression of the treadle, the

operator positions the margin of the work piece against the margin guide4 (Fig. 28) with the body of the work piece resting on the work support2, the circular work table 56, and the table 63. At this time, thepucker o forming and work feeding means are going through theiroperating cycle but are ineffective since the work piece resting on thework supporting elements is in a lowered position as determined bydepression of the treadle.

When the work piece is properly positioned in operating position, theoperator releases the treadle causing the work supporting elements to beraised by the spring 44 to their operating positions as determined bythe en-' gagement of the stop collar 48 with the lower end of the sleeve46, the forming roll 282 also swinging rearwardly to operating positionadjacent to the heated wiper 112.

At the beginning of the pucker forming cycle of the machine thepresserfoot 80 is held down by its spring 90 (Fig. 21) to clamp the workpiece against the beveled portion 82 of the work support, thuseffectively preventing movement of the work piece while the crimpingtool 100 is raised, as seen in Fig. 29. At this time the work engagingsurface of the gripper is yieldingly maintained by its spring 102 in aposition substantially flush with the beveled portion 82 on the worksupport to engage the lower surface of the work piece directly underdepresses the arm 92 (Fig. 21) of the presser foot to raise the presserfoot for releasing the work piece to the action of the tool. Continueddownwardmovement of the crimping tool forces the margin of the workpiece down over the edge of the work support, the gripper 20 "acting atthis time to yieldingly clamp the work piece against the lower end ofthe tool. The effect of the combined action of the tool and the gripperis to ad-- vance the work piece along the work support and down over theedge of the plate 6 adjacent to the bevel 82 to form'a pucker in themargin of the work piece. At the lower limit of the downward movement ofthe crimping tool, the pucker formed in the work piece is partiallyforced by the tool into one of the peripheral grooves 58 in the circularwork table 56, as illustrated in Fig. 30. At this time the table 56 isheld stationary by the hold ing pawl 154 (Fig. 9) so that one of thegrooves is in position to receive the pucker. Also, as the tool movesdown, the member 176' (Fig. 13) moving down with the carrier arm 110,engages the arm 200 and the rearward end of the feeding pawl 152,causing the holding pawl to swing rearwardly out of engagement with thetable and causing the feeding pawl 152 to move forward into engagementwith thet'able in preparation for the feeding movement of the circulartable. 1

After forming a pucker in the work piece, the crimping tool,'whileholding the formed pucker in one of the grooves 58, moves lengthwise ofthe margin of the work piece as viewed in Fig. 31, the tool being somoved by the cam 124 (Fig. 11) acting through the member 122 and thecarrier arm 110. As the crimping tool, being carried by the arm 110, ismoved lengthwise'of the work piece margin, the slide-158 (Figs. 8 and 9)mounted on its slideway 160 and carrying the feeding pawl 152, is movedby the rod 182, also carried by the arm 110, in an arcuate pathconcentric with the circular work table. Since at this time the feedingpawl 152 is held in engagement with the table 56, the table is rotatedby the pawl in timed relation to the lengthwise movement of the crimpingtool. Thus, while the tool holds the pucker in a groove, the table feedsthe work piece. As the tool moves with the work piece, it moves awayfrom alinement with the gripper 20 which is then free to be swung up bythe spring 102 to its initial'position, thus imparting a drag to thework piece adjacent to the crimping tool to assist in forming the nextpucker. After losing contact with the gripper, the pucker is moved bythe circular work table onto the arcuatework support 62 which incooperation with the table will support the lower surface of the pucker,while the upper surface of the pucker is engaged by' the heated wiper112. As the work piece is fed by the table 56, the wiper is moved in anarcuate path at the same speed and in the same direction as the workpiece, thus applying no wiping action at that time to the work piece,the wiper being so moved along the slideway 216 by the abutment 252(Fig. 14) moving with the carrier arm and engaging the extension 254 onthe wiper block carrying plate 208. Thus, during the feeding cycle ofthe machine, the table 56, the crimping tool 100, the wiper 112, and thework piece all move together in unison. As the slide 158, its feedingpawl 152, and the member 176 reach the limit of their feeding movement,the member 176 loses contact with the arm 200, allowing the spring 194to swing the holding pawl forward to engage the next groove in thetable. At the same time the feeding pawl 152 is moved rearwardly by itsspring 172 out of engagement with the table 56, and the holding pawlserves to prevent movement of the table and also serves to position thenext groove 58 for receiving the next pucker formed by the crimpingtool. While the crimping tool is returning td its-initial position, thewiper 112 .is moved to the left as viewed in Fig. 31 to wipe over and.apply heat to the newly formed pucker for permanently setting the puckerin -the work piece material. At this time the work table is heldstationary by the holding pawl, and the presser foot 80 is holding thework piece down against the sup port 2, thus effectively preventinglengthwise motion of the work piece.

After the setting operation performed by the heated wiper, the puckeredmargin of the work piece, due to the progressive feed motion, moves fromunder the heated wiper to be'engaged by'the cooling iron 310. Thecooling iron serves to dissipate heat from the hot margin of the workpiece so that the puckered material is cooled and hardened before anyaccidental deformation of the work piece margin can take place. Whilethe work piece is being fed under the wiper, the forming roll 282 lyingadjacent to and cooperating with the heated wiper serves to bulge thebody of the work piece up at substantially right angles to the margin ofthe work piece engaged by the Wiper to form a flange F along thepuckered margin of the work piece, as well as to impart a prelastedshape to the body of the work piece.

When the desired portion of the work piece has been crimped, theoperator depresses the treadle, causing the forming roll to be movedforwardly away from the wiper and causing the work supporting elementsto be lowered so that the work piece may be removed from the machine.

While the invention is herein illustrated as applied to a machine forcrimping the forepart margin portion of a shoe upper, it is to beunderstood that the machine shown is merely a preferred embodiment whichhas been shown and described for illustrative purposes only.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent of the United States is:

-l. in a machine for crimping the margin of a piece of sheet material, awork support, means operative intermittently in cooperation with saidsupport for forming "a pucker in the margin of a work piece, and feedingmeans operable intermittently in timed relation to the operation of saidpuckering means for holding said work piece stationary while saidpuckeringmeans forms a pucker insaid work piece and for advancing saidwork piece lengthwise of its margin after formation of said puckerwhereby a succession of uniform puckers is formed step bystep in themargin of said work piece.

2. in a machine for crimping the margin of a piece of sheet material, awork support, means operative intermittently in cooperation with saidsupport for forming a pucker in the margin of a Work piece, feedingmeans operable intermittently'in timed relation to the operation of saidpuckering means for holding said work piece stationary while saidpuckering means forms a pucker in said workpiece and for advancing saidwork piece lengthwise ofits margin after formation of said puckerwhereby a succession of uniform puckers is formed step by step in themargin of said work piece, and'rneans for permanently-setting thepuckers formed in said margin.

3. In a machine for crimping the margin of a piece of sheet material,means operable in'directions normal to the fiat surface of a work piecefor forming a pucker of predetermined amplitude in the margin of saidwork piece, and feedingmeans operable intermittently for advancing saidwork piece lengthwise of its margin after formation of said puckerwhereby a succession of uniform puckers is -formed step by step'in themargin of said workpiece to shorten said-margin to a predeterminedlength.

4. In a machinc for crimping thcmarginof a piece of sheet material, a'work support, a crimping tool operable in directions normal to thesurface of a'wo'rk ;pie'ce'for forming a'puckerin the 'margin of saidworkipiece, and feeding means operable intermittently to hold'said workpiece stationary while said tool forms a pucker and to stationary whilesaid tool forms a pucker and to advance said work piece after formationof said pucker whereby a plurality of puckers is formed step by step inthe margin of said work piece to shorten said margin to a predeterminedlength, and means for controlling the elfectiveness of said tool to varythe amplitude of the puckers formed thereby whereby the predeterminedlength of said margin may be varied.

6. In a machine for crimping the margin of a piece of sheet material, awork support, a crimping tool operable in directions normal to'thesurface of a work piece for forming a pucker in the margin of said workpiece, feeding means operable intermittently to hold said work piecestationary While said tool forms a pucker and to advance said work pieceafter formation of said pucker whereby a plurality of puckers is formedstep by step in the margin of said work piece to shorten said margin toa predetermined length, and means for permanently setting the puckersformed in said margin.

7. In a machine for crimping the margin of a piece of sheet material, awork support, a crimping tool operable in directions normal to thesurface of a work piece for forming a pucker in the margin of said Workpiece, feeding means operable intermittently to hold said work piecestationary while said tool forms a pucker and to advance said Work pieceafter formation of said pucker whereby a plurality of puckers is formedstep by step in the margin of said work piece to shorten said margin toat predetermined length, and means to apply heat and pressure to thepuckered margin of the work piece to set the puckered materialpermanently.

8. In a machine for crimping the margin of a piece of sheet material, awork support, a crimping tool operable in directions normal to thesurface of a work piece for forming a pucker in the margin of said workpiece, feeding means operable intermittently to hold said work piecestationary while said tool forms a pucker and to advance said work pieceafter formation of said pucker whereby a plurality of puckers is formedstep by step in the margin of said work piece to shorten said margin to-a predetermined length, means to apply heat and pressure to thepuckeredmargin of the work piece to set the puckered material permanently, andmeans to cool and harden the puckers after the application of heat andpressure by said setting means.

9. In a machine for crimping the margin of a piece of sheet material, awork support, a crimping tool operable in directions normal to thesurface of a work piece for forming a pucker in the margin of said workpiece, feeding means operable intermittently to hold said work piecestationary while said tool forms a pucker and to advance said workpieceafter formation of said pucker whereby a plurality of puckers is formedstep by step in the margin of said work piece to shorten said margin toa predetermined length, and means tostretch and bulge the portion of theworkpiece adjacent to the puckered margin thereby forming a' flangealong .said margin and preshaping the body of the work piece.

' 10. In a machine forcrimping the margin of a piece of sheet-material,a work support, a-crimping tool, operating means for-movingwsaid tool,in' directions normal to the surface, of a workpiece for causing. saidtoolto form a pucker inithe margin of said. work piece, feeding meansoperable intermittently in timed;relation to the move-- menttof said:tool whereby the workpiece is held stationary whilesaid operating meanscauses said-toolto-form tion of said pucker whereby a plurality ofpuckers is formed step by step in the margin of said work piece toshorten said margin to a predetermined length.

11. In a machine for crimping the margin of a piece of sheet material, awork support, a rotatable circular table having notches around theperiphery thereof, a crimping tool operable in directions normal to thesurface of a work piece on said support and said table for form ing asuccession of puckers one at a time along the margin of said work piece,means operable intermttently and adapted to engage said table forsuccessively locating each notch in said table in a position to receivea pucker formed in the margin of said work piece by said crimping tool,means for intermittently rotating said table after formation of eachpucker for advancing saidwork piece, and means for operating saidlocating means and said table rotating means in timed relationshipwhereby a plurality of puckers is formed step by step along the marginof said work piece thereby shortening said margin to a predeterminedlength.

12. In a machine for crimping the margin of a piece of sheet material, awork support, a rotatable circular table having notches around theperiphery thereof, a crimping tool operable in directions normal to thesurface of a work piece on said support and said table for forming asuccession of puckers along the margin of said work piece, a holdingpawl adapted to engage said table during the pucker forming movement ofsaid tool whereby each notch in said table is successively located inposition to receive a pucker formed by said tool, a feeding pawl adaptedto rotate said table after formation of each successive pucker toadvance the work piece, and means to operate said holding pawl and saidfeeding pawl in timed relationship whereby a plurality of puckers isformed step by step along the margin of said work piece therebyshortening said margin to a predetermined length.

13. In a machine for crimping the margin of a piece of sheet material, awork support, a crimping tool, means for moving said tool in directionsnormal to a surface of a work piece for causing said tool to form asuccession of puckers in the margin of said work piece, means for movingsaid tool lengthwise of said margin after formation of each pucker, arotatable circular table having notches around the periphery thereofadapted to receive each pucker as it is formed by said tool, and meansfor holding said table while said tool forms a pucker and for rotatingsaid table in timed relation to the lengthwise movement of said tool toadvance said work piece lengthwise of its margin after formation of saidpucker whereby a plurality of puckers is formed step by step along saidmargin thereby shortening said margin to a predetermined length.

14. In a machine for crimping the margin of a piece of sheet material, awork support, a crimping tool, means for moving said tool in directionsnormal to a surface of a work piece on said support for causing saidtool to form a succession of puckers in the margin of said work piece, arotatable circular table having notches around the periphery thereofadapted to receive each pucker as it is formed by said tool, and meansfor intermittently rotating said table about an axis extendingperpendicular to the surface of said work piece in timed relation to theaction of said tool for holding said work piece stationary while saidtool forms a pucker and for advancing said work piece after formation ofsaid pucker whereby a plurality of puckers is formed step by step in themargin of a work piece thereby shortening said margin to a predeterminedlength.

15. In a machine for crimping the margin of a piece of sheet material, awork support, a crimping tool, means for moving said tool in directionsnormal to a surface of a work piece on said support for causing saidtool to form a succession of puckers in the margin of said work piece, arotatable circular table having notches around the pc- I ,.14ripheryrthereofnadapted formed by said tool, means for intermittentlyrotating said table about an axis extending perpendicular to the surfaceof said work piece in timed relation to the action of said tool forholding said work piece stationary while said tool forms a pucker andfor advancing said work piece after formation of said pucker whereby aplurality of puckers is formed step by step in the margin of a workpiece thereby shortening said margin to a predetermined length, a membercooperating with said table to support the puckers formed in the workpiece, and heated means operable after each pucker is formed to presssaid pucker against said member and said table thereby permanentlysetting the puckered material. V

16. In a machine for crimping the margin of apiece of sheet material, awork supportf'a crimping tool, means for moving said tool in directionsnormal to a surface of a work piece on said support for causing saidtool to form a succession of puckers in the margin of said work piece, arotatable circular table having notches around the periphery thereofadapted to receive each pucker as it is formed by said tool, means forintermittently rotating said table about an axis extending perpendicularto the surface of said work piece in timed relation to the action of.said tool for holding 'said work piece stationary while said tool formsa pucker 'and for advancing said work piece after formation of saidpucker whereby a plurality of puckers is formed step by step in themargin of a work piece thereby shorteningsaid margin to a predeterminedlength, a member cooperating with said table to support the puckeredmargin of said work piece, a heated wiper adapted to engage saidpuckered-margin, and means operable after formation of each pucker formoving said wiper to press'each pucker against said member and saidtable I and to apply heat to'each pu cker thereby permanently settingsaid puckered margin,

17. In a machine for crimping the margin of apiece of sheet material, a.work support, a crimping tool, means for moving said tool in directionsnormal to a surface of a work piece on said support for causing saidtool to form a succession of puckersin the margin of said work piece, arotatable circular table having notches around the periphery thereofadapted to receive each pucker as it is formed by said tool, means forintermittently rotating said table about an axis extending perpendicularto the surface of said work piece in timed relation to the action ofsaid tool for holding said work piece stationary while said tool forms apucker and for advancing said work piece after formation of said puckerwhereby a plurality of puckers is formed step by step in the margin of awork piece thereby shortening said margin to a predetermined length, amember cooperating with said table to support the puckeredmargin ofsaidwork piece, aheated wiper adapted to engage said puckered margin, meansoperable after formation of each pucker for moving said wiper to presseach pucker against said member and said table and to apply heat to eachpucker thereby permanently setting said puckered margin, and means tocool and harden the puckers set by said wiper.

18. In a machine for crimping the margin of a piece of sheet material, awork support, a crimping tool, means for moving said tool in directionsnormal to a surface of a Work piece on said support for causing saidtool to form a succession of puckers in the margin of said work piece, arotatable circular table having notches around the periphery thereofadapted to receive each pucker as it is formed by said tool, means forintermittently rotating said table about an axis extending perpendicularto the surface of said work piece in timed relation to the action ofsaid tool for holding said work piece stationary while said tool forms apucker and for advancing said work piece after formation of said puckerwhereby a plurality of puckers is formed step by step in the margin of awork piece thereby shortening said margin to a predetermined length, amember cooperating with said table to support o. re eiv ea ,..p ck .,a tis,

greases the p ckere ma g of .sais W r Pi??? a hea ed e adapted to' en'gagesa-id puckered margin'n eaiseperaeie after formation ofe'a'chpu'cker formoving said wiperto press each pucker against saidmemberand said table and to app-1y heat to each'pucker therebypermanently setting said puckered margin," and means cooperating withsaid wiper to stretch and bulge the portion of the work piece adjacentto the puckered margin thereby forming a flange along the margin of saidwork piece. 19. In a machine for crimping the margin er a piece of sheetmaterial, a member having a surface arranged to support the marginalportion "of a work piece, means operative to displace said work pieceover an, edge of said member in a direction normal to said supportingsurface to form a pucker in the margin of said work piece, and meansoperative intermittently .to hold said work piece during formation ofsaid pucker and to advance said work piece lengthwise of; its marginafter formation of said pucker whereby a series of puckers may be'formedstep by step along said margin thereby shortening said margin to apredetermined length.

20. In a machine for crimping the margin of a piece of sheetmaterial, amember having a surface arranged to support the marginal portion of awork piece, means operative to displace said work piece over an'edge ofsaid member in a direction normal to said supporting surface to form apucker in the margin of said work piece, means operative intermittentlyto hold said "work piece during formation of said pucker and toadvancesaid work piece lengthwise of its margin after formation of saidpucker whereby a series of puckersmay be formed step by step along saidmargin "thereby shortening said margin to a predetermined length, and rneans for permanently setting the puckers formedffin sai "margin; '21. Ina machine for jcrimping thejmarginiof apiece of sheet material, a memberhaving a surface arranged to support the marginal portion ofa workpiece, means operative todisplace said work piece over an edge of saidmember in a direction normal to 'saidsupporting surface to Emmapucker'in themargin [of said work piece, means operative intermittentlytohold said work piece during formation of said PUQkS and to advancesaid work piece lengthwise of its margin after formation of said uckerwhereby a' series of puc kers maybe formed step by step along saidmargin thereby shortening said margin to a predetermined length, andmeans to apply 'heat and pressure toeach pucker to permanently set thepuckered material.

22. In a machine for crimping the margin of apiece of sheet material, amemberhavingaf surface arranged to support the marginal portion of'awork piece, me ans operative to displace said workpiece over anedgeofsaid member in a direction ncr-rnaljto said supporting surface to, forma pucke-r in the margin of said workpiece, means operativeintermittently to hold said work piece during formation of said puckerand to advance said work piece lengthwise of its margin after formationof said pucker whereby a series of pnckers may be formed step by stepalong said margin thereby shortening margin to a predetermined length,and means to stretch and bulge the work piece adjacent to its puckeredmargin thereby forming a flangealong said margin.

23. In a machine for crimping the margin of a piece of sheet material, amember having a surface arranged to supportt'he marginal portion of awork piece, means operative to displace said work piece over an edge ofsaidmember ina direction normal to said supporting surface to form apucker in the margin of said work piece, means operative intermittentlyto hold said work piece during fioirmation of said pucker and to advancesaid work piece lengthwise of its margin after formation of said puckerwhereby a series of puckers may be formed step by step along said marginthereby shortening said margin to a predetermined length, means to applyheat and pressure toeaoh pucker to permanently set the puckeredmaterial, and means to cool and harden the puckered material a ftertheapplication of heat and pressure by said setting means.

24; In a machine for crimping the margin of a piece of'shee't material,a work support, a crimping tool movable in directions normal to theplane of a work piece on said st -PP fl; a yieldable clamping memberarranged to clamp a portion of the margin of said work pieceagainst'said tool, means for moving said tool in said directions todisplace normally tofsaid plane a small area of said margin against theresistance of said member for forming a" pucker in said margin, andmeans for intermittentlyadvancing-the work piece'lengthwise of itsmargin after for nlaticin of said pucker whereby said tool may formaseries of nniformpuckers stepby step along said 25 In a machine forcrimping the margin of a piece of sheet material, "awork support, acrimping tool operable in directions normal to the plane of awork pieceon said support, a 'yieldableclamping member arranged to clampaportion-of"the' margin of saidwork piece againstsaid tool, means formoving said tool insaid directions to dis place'normally to said plane asmallarea of said margin against the resistance of said member forforming a pucker in said margin, meansfor intermittently advancing thework piece lengthwise 'of its margin after formation ofsaiid puckerwhereby saidtool' may form a series of puckers step by step along saidmargin, and means'for'perrnanent-ly 'settingthe puckers formed in saidmargin.

No references cited.

